Also, D&D suffers from boring level ups where you don't get to make any decisions,
So my take:
+1 ASI every two levels.
Feat every three levels. (feats can be rebalanced and with level requirements)
ok, but you are not really addressing the problem that you have mentioned. D:OS2 have you attributes every level and it was still boring, because attributes don't develop character in interesting way - they just get progressively better in a very boring and uninteractive way in the thing they are already good at.
Maybe multiclassing will spice things up a bit?
